Not really. If you had a 5.1 system, you can hook up two, but they would put out the same information with a Y connector.
If you had a 7.1 system, same thing. Most lower end receivers have a Y connector inside and have two RCA connectors for sub 1 and sub 2, but are really combined information.
If you have a dedicated 7.2 or higher system, there maybe independent control over each sub when setting it up. Is it needed, no, is it nice, yes.
JP